package com.leonzhangxf.client.invoke;

import com.leonzhangxf.common.JSONSerializer;
import com.leonzhangxf.common.RpcEncoder;
import com.leonzhangxf.common.RpcRequest;
import com.leonzhangxf.service.IUserService;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 消费者
 */
public class RPCConsumer {

    //1.创建一个线程池对象  -- 它要处理我们自定义事件
    private static ExecutorService executorService =
        Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    //2.声明一个自定义事件处理器  UserClientHandler
    private static UserClientHandler userClientHandler;


    //3.编写方法,初始化客户端  ( 创建连接池  bootStrap  设置bootstrap  连接服务器)
    public static void initClient() throws InterruptedException {
        //1) 初始化UserClientHandler
        userClientHandler = new UserClientHandler();
        //2)创建连接池对象
        EventLoopGroup group = new NioEventLoopGroup();
        //3)创建客户端的引导对象
        Bootstrap bootstrap = new Bootstrap();
        //4)配置启动引导对象
        bootstrap.group(group)
            //设置通道为NIO
            .channel(NioSocketChannel.class)
            //设置请求协议为TCP
            .option(ChannelOption.TCP_NODELAY, true)
            //监听channel 并初始化
            .handler(new ChannelInitializer<SocketChannel>() {
                protected void initChannel(SocketChannel socketChannel) throws Exception {
                    //获取ChannelPipeline
                    ChannelPipeline pipeline = socketChannel.pipeline();
                    //设置编码
                    pipeline.addLast(new StringDecoder());
                    //添加自定义事件处理器
                    pipeline.addLast(new RpcEncoder(RpcRequest.class, new JSONSerializer()));
                    pipeline.addLast(userClientHandler);
                }
            });

        //5)连接服务端
        bootstrap.connect("127.0.0.1", 8999).sync();
    }

    public static void main(String[] args) throws NoSuchMethodException {
        RpcRequest rpcRequest = new RpcRequest();
        rpcRequest.setClassName(IUserService.class.getName());
        Method method = IUserService.class.getMethod("sayHello", String.class);
        rpcRequest.setMethodName(method.getName());
        rpcRequest.setParameters(new Object[]{"hello leon"});
        rpcRequest.setParameterTypes(method.getParameterTypes());
        rpcRequest.setRequestId(UUID.randomUUID().toString());

        JSONSerializer jsonSerializer = new JSONSerializer();
        byte[] serialize = jsonSerializer.serialize(rpcRequest);
        RpcRequest deserialize = jsonSerializer.deserialize(RpcRequest.class, serialize);
        System.out.println(deserialize);
    }

    //4.编写一个方法,使用JDK的动态代理创建对象
    // serviceClass 接口类型,根据哪个接口生成子类代理对象;   providerParam :  "UserService#sayHello#"
    public static Object createProxy(final Class<?> serviceClass) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
            new Class[]{serviceClass}, new InvocationHandler() {
                @Override
                public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
                    //1)初始化客户端cliet
                    if (userClientHandler == null) {
                        initClient();
                    }

                    RpcRequest rpcRequest = new RpcRequest();
                    rpcRequest.setClassName(serviceClass.getName());
                    rpcRequest.setMethodName(method.getName());
                    rpcRequest.setParameters(objects);
                    rpcRequest.setParameterTypes(method.getParameterTypes());
                    rpcRequest.setRequestId(UUID.randomUUID().toString());

                    //2)给UserClientHandler 设置param参数
                    userClientHandler.setParam(rpcRequest);

                    //3).使用线程池,开启一个线程处理处理call() 写操作,并返回结果
                    Object result = executorService.submit(userClientHandler).get();

                    //4)return 结果
                    return result;
                }
            });
    }

}
